This paper proposes a new toggle-style negative stiffness viscous damper (TNVD), and evaluates the performance of TNVD with displacement amplification factor (fd) energy dissipation (fE). Firstly, composition characteristics are introduced. Subsequently, is introduced to evaluate ability TNVD, it decomposed into geometric an effective coefficient. Then, based on coefficient, correlation between TNVD’s inter-story deformation studied, improved proposed. By comparison finite element...

This study specifically focuses on the damping efficiency of a damped structure with additional viscous dampers. A two-layer steel frame eight sets dampers is used to conduct series seismic simulation shaking table tests, including non-damped without and two structures placed at 1/2 1/6 beam span, respectively. By conducting these energy dissipation, force, displacement damper, as well parameters such floor acceleration, are obtained. The main indicators calculated, ratio, inter-story...

Generally speaking, the traditional lever amplification damping system is installed between adjacent columns in a building, which occupies significant amount of space building. In contrast to devices different forms, damper displacement intermediate column smaller, and vibration reduction efficiency lower. light these drawbacks, this study proposes new device for energy dissipation reduction, based on an column–lever mechanism with viscous (CLVD). Initially, specific simplified mechanical...

Squid are commercial marine species that have high nutritional value. This study aimed to compare the influences of vacuum frying and atmospheric on physicochemical properties protein oxidation three main parts (ring, tentacle, fin) squid Loligo chinensis. The results showed vacuum-fried (VF) group had lower moisture total fat contents looser microstructures than atmospheric-fried (AF) group. amino acid molecular weight revealed proteins were well preserved during frying. Carbonyl content in...

Deltamethrin, an important pyrethroid insecticide, is frequently detected in human samples. This study aims to assess the potential effects of deltamethrin on health and investigate patterns residue enrichment elimination 112 healthy laying hens. These hens were administered 20 mg·kg-1 based their body weight. Gas chromatography-mass spectrometry (GC-MS) was used pattern The results indicated a significant increase concentration chicken manure during treatment period. By 14th day...

SUMMARY The study concentrated on investigating the relationship of continuous cumulative damage, macroscopic deformation development and failure process mid‐rise shear walls. Nonlinear fiber element model considering effect damage is proposed for evaluating seismic performance wall. Numerical analyses wall specimens are carried out according to obtain evolution index Experiments six L‐shaped subjected reversed cyclic loading verify model. Correlation level established, which provides good...

To improve the seismic performance of Chinese traditional wood-structure houses, this paper proposes to strengthen their mortise and tenon joints by applying an innovative metal damper. According dimensions “Yikeyin” houses in Tonghai area Yunnan Province, two groups six samples three types were manufactured, which one group was mounted with dampers made Q235 steels. Subsequently, a low-cycle repeated loading test conducted examine overall behavior these joints. Various characteristics...

To study the aseismic performance after reinforcement of mortise-tenon joints folk houses with traditional Chuan-Dou style wood structure and their steel plate, test specimens joints—two for Tou joints, two Ban dovetail joints—were fabricated out hemlock, plates were utilized to reinforce one joint each type on middle part joint. By carrying pseudo-static tests building ABAQUS numerical model; position where be reinforced by was optimized a comparative analysis into results unreinforced...

A new method is presented that simulates nonstationary multipoint earthquake accelerograms at local field points, when the observed ground motions are specified several locations. This process effectively avoids stochastic decomposition of spectral matrix. In addition, it does not use target spectrum and spatial coherence function to define information each point. First, reconstructed using an autoregressive model. Second, a cross-regressive model proposed based on formulation...

In this study, three types of viscoelastic laminated composite dampers (VLCDs) were fabricated and experimentally analyzed. The by adding mesh skeleton materials to acrylic rubber increase its stiffness; can provide greater restoring force passive control structures under the same strain conditions. mechanical properties VLCDs studied measuring maximum shear stress, storage modulus, loss factor, equivalent viscous damping ratio ambient temperature different loading schemes. experimental...

With the installation of rubber isolation bearings in upper and lower ground layers, an isolated step-terrace structure was created. Considering ultimate bearing capacity under tension as critical condition, a comprehensive framework established to evaluate overturning failure mechanisms present structures. The bound nominal aspect ratio identified principal control index within this framework, which incorporates parameters such height (α), width (β), vertical tensile stiffness compressive...

Acidic wastewater from steel works was selected to reduce pyrolusite. The effects of leaching parameters such as the ratio FeCl2 MnO2, temperature, liquid–solid and initial HCl concentration in acidic on rate manganese were investigated. results show that under conditions including molar MnO2 (mFeCl2/mMnO2) at 2.2, temperature 363 K, a time 180 min, an L/S 11:1, 2.5 mol/L, pyrolusite 97.14%. An unreacted shrinking core model employed explore kinetics arising reduction plants. imply...

A mortar overlay on damaged adobe masonry is employed for its load carrying capacity improvement and low skill requirement. Nevertheless, delamination between the wall has been commonly observed due to bonding failure. Physical enhancement (groove, shear dowel, wire mesh) chemical (a novel biological traditional Chinese binder, sticky rice pulp, SRP) are carried out enhance adobe. The high-moisture adsorption also utilized alleviate water accumulation resulting from application of earthen...