Owing　to　the　economic　cost　associated　with　data　acquisition　and　additional　practical　reasons,　the　number　of　sensors　is　always　limited　compared　with　the　large　scale　of　structures.　To　successfully　monitor　a　structure,　responses　are　often　required　at　all　of　its　critical　areas,　although　situations　may　exist　in　which　the　desired　locations　are　not　accessible　for　measurements　during　its　operation.　Thus,　response　reconstruction　at　those　key　structural　locations　where　sensors　are　not　available　is　essential　to　achieving　the　structural　health　monitoring　(KIM)　objectives.　Moreover,　multiple　types　of　damage　can　occur　simultaneously　in　the　structures,　including　the　local　and　global　damage.　To　obtain　accurate　damage　detection　results,　multi-scale　measurements　are　requited.　In　view　of　these,　multi-scale　response　reconstruction　at　the　critical　locations　of　the　structures　using　the　measurements　is　paramount　importance　to　effectively　identify　the　structural　damage.　A　method　of　multi-type　sensor　optimal　placement　for　multi-scale　response　reconstruction　has　been　proposed　recently　by　the　authors,　including　accelerometers,　displacement　and　strain　measurement　sensors.　Experimental　investigation　is　further　conducted.　Due　to　the　limitation　of　experimental　equipments,　two　data　acquisition　systems　are　employed　in　experiments,　causing　nonsynchronous　responses.　However,　the　synchronization　of　responses　is　required　in　the　integrated　responses　reconstruction.　Therefore,　this　paper　designed　a　synchronous　strain　hammer　to　realize　the　synchronization　of　the　strain,　displacement,　and　acceleration　responses.　The　synchronous　three　types　of　responses　are　integrated　to　reconstruct　the　multi-scale　responses　at　the　locations　without　sensors.　The　reconstructed　responses　match　well　with　the　measured　ones.　The　results　show　that　the　designed　synchronous　strain　hammer　is　feasible　and　efficient.