Abstract
An economically efficient yet safe design of concrete structures under high-cycle fatigue loading is a rather complex task. One of the main reasons is the insufficient understanding of the fatigue damage phenomenology of concrete. A promising hypothesis states that the evolution of fatigue damage in concrete at subcritical load levels is governed by a cumulative measure of shear sliding. To evaluate this hypothesis, an experimental program was developed which systematically investigates the fatigue behavior of high-strength concrete under mode II loading using newly adapted punch through shear tests (PTST). This paper presents the results of monotonic, cyclic, and fatigue shear tests and discusses the effect of shear-compression-interaction and load level with regard to displacement and damage evolution, fracture behavior, and fatigue life. Both, monotonic shear strength and fatigue life under mode II loading strongly depend on the concurrent confinement (compressive) stress in the ligament. However, it appears that the fatigue life is more sensitive to a variation of shear stress range than to a variation of compressive stress in the ligament.
Highlights
The characterization of concrete fatigue has been a research topic for several decades and has been extensively investigated and discussed in literature
A test setup that can be used to investigate the material behavior of concrete under compressive shear loading was presented
The presented punch through shear tests (PTST) setup is applicable for introducing steady compressive shear loading in a very straightforward manner without causing secondary cracks
Summary
The characterization of concrete fatigue has been a research topic for several decades and has been extensively investigated and discussed in literature. LS1: The first loading scenario introduces a monotonically increasing displacement at the rate of 0.1 mm/min (controlled by the displacement of the test piston) until a maximum displacement of 6 mm This allows the maximum shear strength τmax to not Materials 2021, 14, 7675 only be derived as a function of confinement σc, and the complete stress-displacement curve. A test setup should be used where a constant shear stress over the ligament height can be applied and is not affected by the size effect [33,37] This und40ermlimnes the arati4o0n, since even small imperfections65camnmhave a importance of accurate specimen prononuontccheedcciennftrliucence on the load prep8-of transfer a3n0d final shear strength. Sst.hinSecrineefctoehriteshaiisslwaisacyaosmcobpmelipacslaisctoeacdtieadatenaddnwdtimittihme-tech-ocenolsniugsmuamineinggttask fhotaersihgkhifgtoh.rA-chlyitgechrlen-cafyatictvilgeelufyae,tialgotuaedestilnosgaed,tulionpwgs,h-lcooywucll-decytbecelsetustseaesdrteswsaurheietraseubilateac,bowlnehs, tewarnehtedrsiehsepdaliarspcseltarmecessmnote-vnceot-rncttohrnoe-lled llotirgaodalmliendegnltioshaaedpiignphgltiecidsanwapbiepthlaipeudpnlliwoedaitdhainnudgnilssotatehdpuisnsagntosdt ieafpfffeserceatntedtddibfiyfseptrhelanectseidmzeiseepnfltfasec.cetFm[i3ge3nu,t3rse7.]7.Faigsuhroew7sa the reshsuowlt softhseurcehsualteosft swucithhafitveestlowaidthinfigveanlodaudinnlgoaadnidngunsltoeapdsi.ng steps
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